2-Part Epoxy Primer/ Filler

GacoFlex E5320 is a two-component, water-based epoxy primer that is ideal for use on most roofing surfaces including metal roofs and flashings. This easy-to-apply primer bonds to properly prepared roofing surfaces and improves adhesion of GacoFlex silicone coatings and other top coats, especially on weathered surfaces that are difficult to get completely clean.

On asphalt-based surfaces it may help prevent bleed-through, and when top coated will help prevent corrosion. When mixed with ordinary sand, it’s a masonry block filler.



IMPROVES TOP COAT ADHESION. GacoFlex E5320 is an excellent multi-purpose primer that improves adhesion of GacoFlex Silicone Coatings and other top coats.


MASONRY BLOCK FILLER. When combined with ordinary sand, GacoFlex E5320 works great as a masonry block filler.

EXCELLENT ADHESION. GacoFlex E5320 offers excellent adhesion to most surfaces including metal roofs, metal flashing, single-ply membranes and more.

50-YEAR LIMITED MATERIAL WARRANTY. All GacoFlex Coatings Carry a 50 Year Limited Material Warranty.